Pattern mechanism for dobby looms



Feb. 26, 1952 I. C. MORRIS PATTERN MECHANISM FOR DOBBY LOOMS Filed Dec. 26, 1950 127 m 0 U 6 7 "7 I r f B 122 124 m4 ea 3 Sheets-Sheet l In Y C. Megmm,

INV NTOR.

ATTORNEYS.

Feb. 26, 1952 C ls 2,587,507

PATTERN MECHANISM FOR DOBBY LOQMS Filed Dec. 26, 1950 5 Sheets-Sheet 2 Mom/s,

INVENTOR.

[VE'Y C.

gamma v ATTORNEYS.

Feb. 26, 1952 l. c. MORRIS ,5

PATTERN MECHANISM FOR DOBBY LOOMS Filed Dec. 26, 1950 3 Sheets-Sheet 3 121' 3 g2 37 rj 11 7 lvir C. MORRIS,

INVENTOR.

BY gJ v-M ATTORNEYS.

Patenteci Feb. 26, 1952 UNHTED STATES ATT 10 Claims.

This invention relates to looms and more especially to improvements in the pattern mechanism for dobby looms and including means for decreasing the number of links or bars on the usual pattern chain which may normally be required for controlling a fabric pattern which has a plurality of different type weaves therein.

Heretofore, in many instances, it has been necessary to provide a chain link or bar for each pick in the pattern, even though the weave might repeat itself every few picks, thus requiring a very long pattern chain to operate this pattern mechanism. The space taken up by a very long pattern chain and the cost of constructing the same makes a short pattern chain very desirable.

It is therefore an object of this invention to provide an improved pattern mechanism for a dobby head comprising a pattern chain having a plurality of link bars therein for controlling the head, with means for moving the pattern chain forwardly or rearwardly for a predetermined number of picks and means for also stopping the pattern chain for a predetermined number of picks. By using this type of pattern mechanism the same chain bars may be used over and over in a repeat weave thereby allowing pattern chains which are normally of considerable length to be shortened to a minimum number of bars or links.

It is another object of this invention to provide an improved pattern mechanism for a dobby head which includes means for controlling a plurality of different type weaves in a fabric comprising an endless bar chain with a group of bars therein for each type of weave in the fabric, alternate weaves requiring oscillatory motion of the pattern chain and other weaves requiring forward motion of the pattern chain.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds, when taken in connection With the accompanying drawings, in which- Figure 1 is a front elevation of a dobby head mechanism showing the invention secured thereto and showing the same attached to a part of a loom;

Figure 2 is an enlarged fragmentary vertical sectional view taken substantially along the line 2-2 in Figure 1;

Figure 3 is a side view of the dobby head mechanism looking at the right-hand side of Figure 1;

Figure 4 is an enlarged fragmentary plan view with parts in section taken substantially along the line 4-4 in Figure 3;

Figure 5 is an isometric view of a portion of fabric, the weaving of which may be controlled by the improved pattern mechanism;

Figure 6 is a schematic vertical sectional view taken substantially along the line 6-6 in Figure 3;

Figure 7 is an enlarged fragmentary elevation looking substantially along the line 1-1 in.

Figure 1.

Referring more specifically to the drawings, the numeral Ill designates the side frame of a loom on which this improved dobby head pattern mechanism broadly designated at H is adapted to be mounted at its lower end and its upper end being suitably secured to a conventional loom arch 2. The pattern mechanism H comprises a pair of side frames 13 and It in which is journaled a suitable rocker shaft I 5. Suitably secured to the right-hand end of the rocker shaft I5, in Figure 3, is a rocker it which has pivotally connected to the upper and lower ends thereof, connecting links 28 and ?.i which are pivotally connected to the right-hand ends of upper and lower dobby knives 22 and 23.

The left-hand ends of the dobby knives 22 and 23 (Figure 3) have similar connecting links 24 and 25 pivotally connected thereto which extend to the left in Figure 1 and are pivotally mounted on the respective upper and lower ends of a driving rocker 26, fixedly mounted on the left-hand end (Figure 3) of the rocker shaft 15. The driving rocker 26 has an outwardly extending arm 2'! to which the upper end of a downwardly extending dobby connecting rod 31 (Figures 1 and 3) is pivotally connected as at 28. This rod 3i is oscillatably mounted at its lower end on a conventional dobby crank, not shown, which is fixedly mounted on one end of the conventional main cam shaft of the loom.

It is thus seen that, as the loom is in operation, the main cam shaft rotates the dobby crank causing the connecting rod 3! to move up and down in Figures 1 and 3 to rock the rockers 16 and 26 along with the rocker shaft 5 to cause the upper and lower dobby knives 22 and 23 to move along slots 32 and 33 in the side frames i3 and I4. Disposed between the side frames is and Id of the pattern mechanism I! is a transversely disposed shaft 34 (Figures 1 and 6) around which the lower ends of a plurality of dobby jacks 35 are adapted to pivot. Each of these dobby jacks 35 has a slot 36 therein in which a transversely disposed shaft 3? is adapted to act as a stop.

Although all of the dobby jacks are substantially the same one of them is indicated at a and the rest of them are indicated at 35 for purposes to be later described. Each of the dobby jacks 35 and 35a has a plurality of notches 4a in the upper end thereof in which one end of connecting links 4| are adapted to be supported, the other ends of these connecting links being connected to conventional loom harness not shown. The first dobby jack 35a in Figure 1 is peculiar in that it is used to control the improved pattern mechanism and therefore does not have a connectin link 4i attached to its upper end but has a tension spring 42 connected thereto at one end, the springs other end being connected to a suitable spring anchor 43 fixedly mounted on the loom arch I2.

Each of the dobby jacks 35 and 35a has a lever 45 pivotally mounted on an intermediate portion thereof, as at 44 (Figure 6). The upper end of each lever 55 has pivotally connected thereto, as at 45, a hooked arm 41 which at times is adapted to be engaged by the upper dobby knife 22. The free ends of these hooked arms ll are normally held out of engagement with the reciprocating dobby knife 22 by means of corresponding vertically disposed rods 55, the upper ends of which contact and support the lower intermediate portions of these hooked arms 51 so the upper dob-by knife 22 will not engage the hooks of certain of the hookedarms ll as it reciprocates in the slots 32 of the side frames I3 and I4. I

The lower end of each ofv the rods rests on the left-hand end of a dobby finger 5: (Figure 6) which is pivoted intermediate its ends upon a transversely disposed shaft 52. The right-hand end of the dobby finger 5I normally rests upon a transversely disposed supporting bar 53 which spans the distance between the side frames I3 and It. The lower ends of the levers 45 have pivotally connected thereto, as at 56, corresponding hook arms 55 which are similar to the hooked arms 4'! and each of which is normally held out of engagement with the lower dobby knife 23 by an uprising portion 56 of a dobby finger 51, the right-hand end of which also normally rests on the supporting bar 53.

By referring to Figure 6 it will be observed that, as the right-hand end of the dobby finger 51 is raised the hooked arm 55 will be lowered to allow the hook portion of the hooked arm 55 to engage the lower dobby knife 23 as it moves from left to right in Figure 6. Thus, the lever arm 45 will be moved in a counter-clockwise direction to move the dobby jack 35 associated therewith in a clockwise direction to also cause one of the connecting links M to be moved from left to right, in Figure 1, to thereby raise certain of the loom harnesses to which it is connected. This is a conventional operation in the dobby head mechanism.

In a like manner, if the right-hand end of one of the dobby fingers 5| is raised, the vertically disposed rod 50 will be lowered to thereby lower the hooked arm 41 so that it may be engaged and moved to the right in Figure 6 by the upper dobby knife 22 to thus move the associated lever 45 along with its associated dobby jack 35 in a manner identical to the manner just described.

Referring to Figure 1, it will be noted that there is mounted below this dobby mechanism an oil guard 66] which extends downwardly and below the dobby jacks 35 and is fixedly mounted between the side frames I3 and I This oil guard is for the purpose of preventing oil and dirt from the dobby mechanism from getting onto the fabric.

The dobby fingers 5| and 5?, there being one of each for each of the dobby jacks 35, are actuated by suitable pattern pins 3! fixedly mounted in a plurality of pattern chain bars 62 which are linked together to form a pattern chain broadly designated at 9|.

The pattern chain 9| is mounted on a fluted roller 92 (Figures 3 and 6) fixedly mounted on a transversely disposed shaft 93, said shaft having its ends journaled in bearings 34 and 95 on the lower portions of the side walls I3 and M, respectively (Figure 3). The right-hand end of the transversely disposed shaft 93 in Figure 3 has a hand wheel 96 fixedly mounted thereon, the purpose of which is to allow an operator to move the pattern chain along with the fluted roll 32 and the transversely disposed shaft 93 for adjusting the pattern.

The opposite end of the transversely disposed shaft 93 also has a hand wheel I53 fixedly mounted thereon and fixedly mounted between this hand wheel I00 and the side frame I3 are first and second pattern chain driving ratchet wheels IIJI and I 32 which are parts of the present invention. The parts heretofore described, unless otherwise noted, are conventional parts of a dobby loom and it is with these parts that the present invention is adapted to be associated.

The pattern chain driving ratchet wheels ISI and I52 are adapted to, at times, be driven by respective first and second ratchet wheel driving arms or pawls I03 and IEM respectively. These ratchet wheel driving arms 03 and I04 extend upwardly and to the left in Figure 1 and have their upper ends fixedly mounted in block lil'l, oscillatab-ly mounted on one end of a stub shaft IIO (Figure 3), the other end of which is fixedly mounted, as by welding, on a horizontally extending support bracket III, suitably secured to the lower portion of the driving rocker 26 as by screws H2.

The first dobby jack 35a is in this instance, the dobby jack closest to the side frame I3 of the dobby head and has fixedly mounted on the lower end thereof, as by welding, an angle bracket II3 having plate H4 adjustably mounted thereon as by screws H5 (Figure '7 Suitably secured on the adjustable plate II i, as by welding, is one end of a stub shaft H5, its other end having oscillatably mounted thereon a driving pawl II'i adapted to rest on and, at times, drive a ratchet wheel I25 rotatably mounted on a stub shaft I21 and being held thereon by a washer I22 and a nut I23. The inner end of the stub shaft IE1 is suitably secured, as by welding, to a support bracket I27 secured to the side frame 53 by any suitable means, such as screws I28.

The ratchet Wheel I25} has integral therewith and on the back side thereof, in Figure 1, a cam member I24 which engages the lower end of a control lever I26. The control lever I25 is o scillatably mounted intermediate its ends on a stub shaft I30 fixedly mounted in the side frame I3 of the dobby head II and its upper end has one end of a control cable or cord i3I fixedly connected thereto and extending to the right in Figure 1 through a guiding wire I32 and its righthand end being fixedly connected to the upper end of a pin I33. The lower end of the pin I33 is fixedly mounted, as by a pressed fit, in a collar I36 (Figure 4) fixedly mounted on a horizontally disposed shaft I31, the opposed ends of which are oscillatably mounted in a substantially U- shaped bracket I38.

Endwise movement of shaft I31 is prevented by a pair of collars I42 and I43 fixedly mounted on opposed endsof the shaft I31. The righthand leg of the substantially U-shaped bracket I38 extends inwardly in Figure 4 to the side frame I3 and is suitably secured thereto, as by a bolt I44, and has the lower end of the guide wire I32 fixedly mounted thereon in any suitable manner such as by welding. Mounted around the horizontally disposed shaft I3'I, between the collar I36 and the right-hand leg of the substantially U-shaped bracket I38, is a torsion spring I46, one end of which is secured to the right-hand leg of the substantially U-shaped bracket I38 the other end of which is fixedly mounted around the lower portion of the pin I33. The purpose of this torsion spring M6 is to normally urge the horizontally disposed shaft I37 along with the pin I33 in a clockwise direction in Figure 1.

Fixedly mounted on the horizontally disposed shaft i131, between the collar I36 and the lefthand leg of the U-shaped bracket I38 in Figure 4, is a collar I50 having fixedly mounted therein one end of a second pin I5I which extends at an angle relative to the first pin I33 and to the left in Figure l and has fixedly mounted on its outer end one end of a control cable or cord I52. This control cable I52 extends downwardly in Figure 1 and is connected to the ratchet wheel driving arm I03 adjacent its free end.

Connected to the upper end of the first pin I33 is one end of a control cable or cord E55 which extends to the left in Figure 2 and passes over a grooved pulley I56 (Figures 1 and 2) and then extends downwardly therefrom, its lower end being fixedly connected to the adjustment plate II4 on dobby jack 35a, by any suitable means such as a screw I65. By referring to Figure 2, it will be noted that the grooved pulley I56 is rotatably mounted on one end of a stub shaft I51, the other end of which is suitably secured, as by welding, to a support bracket I58 suitably secured, as by a screw I59, to the loom arch I 2.

In operation, as the main crank shaft of the loom rotates along with the dobby crank, the dobby connecting rod 3| will be caused to move up and down to thereby rock the rocker 26 and through the connecting links 25, 2|, 24 and move the upper and lower dobby knives 2'2 and 23 along the slots 32 and 33 in the side frames I3 and I4 to pull any of the hooked arms 41 or 55 outwardly that may have been lowered because of the pattern pins 6| coming into contact with the corresponding dobby fingers 5i and 51 to operate the dobby jacks according to the desired pattern. It is obvious that the driving rocker 23 is caused to rock as the loom weaves and the stub shaft I I0 mounted on bracket- I I I on the rocker 26 will cause the first ratchet wheel driving arm I03 to drive the first ratchet wheel I0| to thereby move the patternchain in a counter-clockwise direction in Figure l in a step-by-step manner while a certain pattern is being made in the cloth.

In order to increase the range of the pattern chain without increasing the effective length of the pattern chain 9|, a special pair of pins 5| a are provided in at least one of the pattern bars 62 (Figure 3) which, when they reach the index point directly under the dobby fingers 5| and 5] corresponding to the first dobby jack 35a,

will cause the hooked arms 47 and 55 to be lowered so that their hookedportions will be engaged by the dobby knives 22 and 23 and be moved outwardly thereby to thus cause the dobby jack 35a to move a partial revolution clockwise about the transversely disposed shaft 34. It is thus seen that, as the dobby jack 35a is moved in a clockwise direction in Figures 1 and 6, the angle bracket H3 and its associated driving pawl lIl will move from left to right in Figure l and the pawl will engage the next tooth on the ratchet wheel I20. Thus, upon this dobby jack 35a subsequently being moved in a counter-clockwise direction, the ratchet wheel I20 will be racked one tooth.

- As the dobby jack 35a is moved in a clockwise direction in Figures 1 and 6, the control cable I55 will be slackened and the pin I33 will move in aclockwise direction in Figure 1, because of the torsion spring I46 (Figure 4), to also move the pin I31 in-a clockwise direction to thereby tighten the control cable wire I52. This will move the first ratchet wheel driving arm I03 out of engagement with the first ratchet wheel |0| and move the second driving pawl I04 into engagement with the second ratchet wheel I02 to thereby reverse the direction of rotation of the pattern chain 9| so it will travel in a clockwise direction in Figure 1 upon the next clockwise movement of the rocker 26, which will then move the previous bar 62, which does not have any pins 6Ia thereon, into indexing position.

Now, since the bar 62 that is then under the index point of the dobby fingers 5| and 51, that control the dobby jack 35a, does not have the special pins Bla thereon, the hooked arms 41 and 55 will not engage the upper and lower dobby knives 22 and 23 and the dobby jack 35a will be pulled in a counter-clockwise direction against the transversely disposed pin 31 by the tension spring 42 on its upper end thereof to thereby tighten the control wire I55 and pull the pin I33 in a counter-clockwise direction in Figure 1 and, through intervening connections, slacken the control wire I52 and allow the first ratchet wheel driving arm I03 to again come into engagement with the first ratchet wheel I0| to move the second ratchet wheel driving arm I04 out of engagement with the second ratchet wheel I02. This will again cause the pattern chain 9| to move a step in rotation in a counter-clockwise direction upon the next clockwise movement of rocker 26, to again bring the pattern bar 62 which has the special pins 6Ia thereon to the index point directly under the dobby fingers 5| and 51.

Thus, upon the next stroke of the rocker 26 in the manner previously described, the pattern chain 9| is moved one step in rotation in a clockwise direction, and the jack 35a also causes the ratchet wheel I20 to move another step in rotation.

This action of weaving a certain pattern using only two pattern bars 62 on thepattern chain 9| may continue for as long as desired and, in this case, for as long as the teeth in the ratchet wheel I20 are racked until the high point of the cam surface I24 engages the lower end of the control lever I26 to move the control lever I26 in a counter-clockwise direction thereby tightening the control cable |3I and causing the pin I33 to be moved in a counter-clockwise direction in Figure 1 to override the mechanism of the dobby jack 35a and slacken the control wire I52 to allow they first ratchet wheel driving arm I03 to move into engagement with the first ratchet wheel IUI twice in succession to drive the pattern chain 9| in a counter-clockwise direction in Figurev 1 until the special pins 6Ia have passed the index point.

At this time, the high point of the cam surface I2 1 will be out of engagement with the lower end of the control lever I26 to permit the control lever I26 to move in a' clockwise direction to thereby slacken the control cable I 3I. However, this would not allow the tension spring I46 to move the pins I5I and I33 in a clockwise direction in Figure l, as would normally be the case, because there are no special pins Iilav under h i h n ers 5.! are 5. and ther fereh d bb t h. 3t wi r mai th posit on shown in F gur 1 s 6 and the eeht l cable. ts wi l he tightened to h l th pins we en i h o n there in F ure The eeh f table il the h s ee and th y a o th first re ehe whe driving arm "13 o remai in en a em n wi h t re he h e 10' he time the. patt n e in e ee hte le kwi e re en in Fi 1 until n r h eia Qe erh Pil t e s siti a t nd Pa t. under th ee ir fin rs n Figure 3 i w ll he bserv d h e he o special pattern pins are disposed on each of a pair of alternate bars I52. This would merely cause the cycle of ratchet wheel I to be repeated. In Figure 5 there is shown a portion of fabric F which has basic areas I65 and striped weftwise extending areas I66- therein, the pattern of areas I66 being the same from pick to :1.

19 r ma var in alt nat n cks- Thue, he area "it they be tveven y repeats of the set thih wo adjacen ba 2 n the dobby mechanism, these bars 62 including eh e e ars h vihs i fil he on n the adjacent bar that does not have the pins tle here at erete re de ri ed The description and operation as heretofore described has been made based upon a doublen X il de y h d t a s picks r woven while the bar having the pins Ela thereon s in er t e e on nd; u o th a c t Wh e ihs en a e o eve the dir ct on of v m o the patte n hain th s pesitienihg a bar whi h does nothave the pins Sia thereon in operative pgsition, twomorepicks are woven, this being repeated with each step in movement y the pa rn c ai in pposit e ons Now, if the operator desires to weave a predetermined number of picks wherein the same harnesses are tobe raised and lowered with successive pairs of picks, the pawl 104 could be removed from the block I01 and the patterning 0n the pattern chain 9| would be so arranged that, with each stroke of the rocket 26 in a clockwise direction in Figure 1, a stroke ina clockwisedirection is also imparted to the special jack a. Thus, the tension spring I46 (Figure 4) on the shaft I3! would" cause the pins I33 and I5I to move upwardly or in a clockwise direction in Figure 1 to thus raise the pawl: I03 out of en.- gagernent with the-corresponding ratchet wheel IIlI. Thus, the ratchet pawl I63 would fail to engage the next succeeding tooth in the ratchet wheel I;0 I'. e

Inthe next" succeeding stroke of the rocker 28, in a counter-clockwise direction in Figure 1, the special jack 3541 also moves in a counter-clock.- is directi to a a n mo the paw I03 into n a ement Withthe rat het Whee ID How.-

ever, since the pawl I03 engages the ratchet wheel IUI only as the rocker 26 moves in a counter-clockwise direction, a step in rotation will not be transmitted to the pattern chain 9I or roller 532 because the pawl IE3 is lowered against the ratchet wheel iii! as jack 35a moves to the left and therefore fails to engage another tooth on the ratchet wheel I6I. The number of picks which may be repeated in this manner is determined by the number of teeth in the sprocket wheel I26.

It is thus seen that the special jack 35a will be caused to move in one direction about its axis with alternate picks by the loom and will be caused to move in the opposite direction with each pick between said alternate picks to thus cause a step in rotation to be imparted to the ratchet wheel I26 with alternate picks by the loom. Thus, the high point on the cam I24 will finally engage the lower end of the control lever I26 to move the pins I33 and IEI in a counterclockwise direction in Figure 1 so that, as the rocker 26 moves in a counter-clockwise direction, after the desired number of picks having been woven by the loom, the ratchet pawl H33 will then engage the next succeeding tooth in the ratchet wheel ii'ii to cause another step in rotation to be imparted to the pattern chain Sit and to thereby again condition the pattern chain SI for normal patterning operations. it is evident that tne rod 5% would have to be removed or the free end of one dobby finger would have to be lowered while the other would be raised so the rocker 26 would cause jack 35a to oscillate with and in the same direction as the rocker 26.

Although a double indexing dobby head is shown in the drawings, it is to be understood that the apparatus may be used equally as eli iciently with a single indexing dobby head.

It is thus seen that I have provided a means for driving the pattern chain in a conventional step-by-step manner in a counter-clockwise direction in Figure 1 and also moving the pattern chain one step in rotation in a counter-clockwise direction and the next step being one step in a clockwise direction for a predetermined number of picks, as desired, to thereby weave particular patterns to, thus, substantially shorten the length of the pattern chain that would ordinarily be required. The length of time that the pattern chain is oscillated or moved in one direction for one step and then reversed for another step is limited only by the size of the ratchet wheel I26 and the number of teeth therein. This ratchet wheel I26 may be replaced with a similar ratchet wheel of a difierent number of teeth according to the desired pattern.

In the drawings and specification there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. An improvement in the dobby head of a loom, said dobby head having dobby jacks and also having a rocker and also having pivoted hooked arms associated with each dobby jack and also having means on the rocker engageable by said hooked arms for imparting movement to the corresponding dobby jacks and also having rotatable pattern means for controlling the operation of the hooked arms for determining the dobby jacks to be operated by the means on the rocker according to a desired pattern, said improvement comprising a block pivotally mounted on the rocker and adapted to move therewith and having first and second spaced ratchet pawls extending therefrom, a first and a second oppositely directed ratchet wheel operatively associated with said rotatable pattern means, the free ends of the first and second pawls being disposed astride and coinciding with the corresponding first and second ratchet wheels, a special dobby jack adapted to be oscillated in response to said pattern means, a normally upwardly biased spring loaded member disposed above the free ends of said pawls, a pliable connection between the normally upwardly biased member and said pawls, a connection between said special dobby jack and the spring loaded member normally permitting the first pawl to ride in engagement with the corresponding ratchet wheel for imparting step-by-step rotation to the pattern means in one direction during operation of said rocker, said connection between the special dobby jack and the spring loaded member being operable with the special dobby jack to thereby permit the spring loaded member to move upwardly to move the second ratchet pawl into engagement with the second ratchet wheel upon the pattern means aiTecting the special dobby jack to cause the same to move in one direction to thereby cause the pattern means to be alternately rotated a step in a reverse direction.

2. In a dobby head for looms having dobby fingers, dobby knives, dobby jacks and a rocker operatively connected to the dobby knives for imparting reciprocatory motion thereto, a roller having a pattern chain mounted thereon and a first movable means for imparting movement to the roller, an improved means for controlling the engagement and disengagement of said movable means comprising a ratchet wheel rotatably mounted on the dobby head, a spring loaded special dobby jack normally biased in one direction, a ratchet pawl carried by said special dobby jack and engaging said ratchet wheel, cam means operatively connected to the ratchet wheel, a second movable means disposed adjacent the cam means, mechanical connections between said second movable means disposed adjacent the cam means and the first movable means associated with the roller and means responsive to the patterning on said pattern chain for moving said special dobby jack away from its spring means momentarily and then for releasing the special dobby jack to permit its spring means to reverse the direction of movement thereof for imparting a step in rotation to said ratchet wheel and said cam means having a high point thereon, wherebyupon a revolution being imparted to the ratchet wheel, the high point of said cam means will engage the second movable means disposed adjacent the same for disengaging the first movable means which drives said roller to thus stop movement thereof.

3. An improvement in a dobby head for looms having dobby fingers, dobby knives, dobby jacks and a rocker operatively connected to the dobby knives for imparting reciprocatory movement thereto and also having a roller provided with a pattern chain mounted thereon and also having a member pivotally mounted on the rocker having a pair of pawls projecting therefrom, a pair .of ratchet wheels operatively connected to the roller and said pawls being disposed on opposed sides of the ratchet wheels, said improvement comprising a third ratchet wheel rotatably mounted on the dobby head, a third pawl carried by one of said dobby jacks and engaging said third ratchet wheel, a pivoted member disposed adjacent said pair of pawls and having spring means associated therewith normally urging the pivoted membe away from the pawls, a cable connected to the pivoted member at one end thereof and having it other end connected to the dobby jack which carries said third ratchet pawl and normally holding the said pivoted member in a position towards said pair of pawls, a connection between the pivoted member and at least one of said pair of pawls and normally permitting one of said pawls to engage the corresponding ratchet wheel to rotate the corresponding ratchet wheel in one direction upon oscillation ofsaid rocker, means on said pattern chain for effecting movement of the dobby jack having the third pawl thereon to thus permit the spring loaded pivoted member to move one of the pair of pawls out of engagement with the corresponding ratchet wheel and to move the other of the pair of pawls into engagement with the other of the ratchet wheels associated therewith for imparting a reverse step in rotation to the roller and its corresponding pattern chain, cam means operatively connected to the third ratchet wheel and means engageable by said cam means for again moving the pivoted member towards the pairof pawls to thus permit the original of said pawls to again move into engagement with the corresponding ratchet wheel to again cause the pattern chain to move in its original direction.

4. An improvement in a dobby head for looms having dobby fingers, dobby knives, dobby jacks and a rocker operatively connected to the dobby knives for imparting reciprocatory motion thereto, a roller having a pattern chain mounted thereon, first and second ratchet wheels having oppositely directed teeth thereon and being operatively connected to the roller, a member pivotally mounted on the rocker and having first and second pawls projecting therefrom and being disposed on opposed sides of the corresponding first and second ratchet wheels, said improvement comprising a spring loaded member normally holding one of the ratchet pawls in a position to rotate the corresponding ratchet wheel in one direction, a cam member rotatably mounted on the dobby head, means responsive to the patterning on the said pattern chain for efiectin intermittent rotation of said cam member, said cam member having a low point and a high point thereon, means engaging said cam and having an operative connection between the same and the spring loaded member and being so arranged.

that, upon one of the points of said cam engaging the same, the pivoted member will be moved in one direction to move the other of said pawls into engagement with the corresponding ratchet wheel and, upon the other of the points of said cam moving into engagement with the meanshaving the operative connection between the same and the pivoted member, the other of the pawls will again be moved into engagement with the corresponding ratchet wheel to thus successively advance and reverse the direction of movement of the pattern chain.

5. An improvement in the dobby head of a loom, said dobby head having dobby jacks and also having a rocker and also having pivoted hooked arms associated with each dobby jack and also having means on the rocker engageable by said hooked arms for. imparting movement to the corresponding dobby jacks and also having rotatable pattern means for controlling the operation of the hooked arms for determining the dobby jacks to be operated by the means on the rocker according to a desired pattern, said improvement comprising a block pivotally mounted on the rocker and adapted to move therewith and having first and second spaced pawls extending therefrom, a first and a second oppositely directed ratchet wheel operatively associated with said rotatable pattern means, the free ends of the first and second pawls being disposed astride and coinciding with the corresponding first and second ratchet wheels, a third ratchet wheel rotatably mounted on the dobby head, a special dobby jack adapted to be oscillated in response to said pattern means and having a third pawl pivotally mounted thereon, the free end of said third pawl engaging the teeth of said ratchet wheel, a normally upwardly biased spring loaded member disposed above the free ends of said pawls, a pliable connection between the normally upwardly biased member and said pawls, a connection between said special dobby jack and the spring loaded member normally permitting the first pawl to ride in engagement with the corresponding ratchet wheel for imparting step-by-step rota tion to the pattern means in one direction during operation of said rocker, said connection between the special dobby jack and the spring loaded member being operable with the special dobby jack to thereby permit the spring loaded member to move upwardly to move the corresponding second ratchet pawl into engagement with the second ratchet wheel upon the pattern means affecting the special dobby jack to cause the same to move in one direction to thereby cause the pattern means to be rotated in a step-bystep manner in a reverse direction, said third ratchet wheel having a cam surface thereon, a lever arm oscillatably mounted on the dobby head, a pliable connection between one end of said lever arm and said spring loaded member, said cam surface having a high point thereon, the end of said lever arm remote from the end having a pliable connection thereon being adapted to engage the cam surface on the ratchet wheel and said pattern means being operable upon the special dobby jack to cause the same to oscillate with certain picks by the loom to thereby cause the first and second pawls to be alternately moved into engagement with the corresponding first and second ratchet wheels to alternately impart movement to the pattern means in opposite directions and to also impart step-by-step movement to said third ratchet wheel upon each oscillation of the special dobby jack whereby, upon said high point of the cam surface moving into engagement with the corresponding end of said lever arm, the pliable comiection at the other end thereof will be pulled taut to cause the spring loaded member to remain in a predetermined position to thus cause a repeated step in rotation of said pattern means in one direction to thus permit the pattern means to be inefiective upon said special dobby jack and thus resulting in continuous step-bystep movement subsequently being imparted to the pattern means in one direction until another cycle in the operation of the third ratchet wheel may be desired.

6. An improvement in the dobby head of a loom, said dobby head having dobby jacks and also having a rocker and also having pivoted hooked arms associated with each dobby jack and also having means on the rocker engage able by said hooked arms for imparting movement to the corresponding dobby jacks and also having rotatable pattern means including a pat tern chain having link bars with pattern pins thereon for controlling the operation of tlie hooked arms for determining the dobby jacks to be operated by the means associated with the rocker according to a desired pattern, said improvement comprising means for repeating the operation of an adjacent pair of bars on the pat tern chain including a block pivotally mounted on the rocker and adapted to move therewith and having first and second spaced pawls extending therefrom, a first and a second oppositely directed ratchet wheel operatively associated with said rotatable pattern means, the free ends of the first and second pawls being disposed astride and coinciding with the corresponding first and second ratchet wheels, one of said pair of bars having special pattern pins thereon,- a special dobby jack adapted to be oscillated in response to the special pattern pins on said bar, a normally upwardly biased spring loaded mem-' ber disposed above the free ends of said first and second pawls, a pliable connection between the normally upwardly biased member and said pawls, a connection between said special dobby jack and the spring loaded member normally permitting the first pawl to ride in engagement with the corresponding ratchet wheel for im parting step-by-step rotation to the pattern means in one direction during operation of said rocker, said connection between the special dobby jack and the spring loaded member being operable with the special dobby jack to thereby permit the spring loaded member to move upwardly to move the second ratchet pawl into engagement with the second ratchet wheel upon the the special pattern pins being moved into operative position to cause the special dobby jack to move in one direction to thereby cause the pattern means to be rotated a ste in a reverse direction.

7. An improvement in a dobby head for looins having dobby fingers, dobby knives, dobby jacks and a rocker operatively connected to the dobby knives for imparting reciprocatory motion thereto, a roller having a pattern chain mounted thereon, first and second ratchet wheels having oppositely directed teeth thereon and being op eratively connected to the roller, a member piv otally mounted on the rocker and having first and second pawls projecting therefrom and being disposed on opposed sides of the corresponding first and second ratchet wheels, said improvement comprising means for holding one of the ratchet pawls in a position to rotate the corresponding ratchet wheel in one direction with movement of the rocker, a cam member movably mounted on the dobby head, means for imparting movement to said cam member in timed relation to operation of the loom and means controlled by said cam member for moving said means holding one of the ratchet pawls in a position to rotate the corresponding ratchet wheel in onedirection to another position to cause the other of the ratchet pawls to rotate the corresponding ratchet wheel in the opposite direction thereby resulting in the pattern chain being advanced for a predetermined number of strokes of the rocker and to be alternately reversed as to its direction of movement for a predetermined num- V ber' of strokes of the rocker.

S. An improvement in a dobby head for looms having dobby fingers, dobby knives, dobby jacks and a rocker operatively connected to the dobby knives for imparting reciprocatory motion thereto, a roller having a pattern chain mounted thereon, first and second ratchet wheels having oppositely directed teeth thereon and being operatively connected to the roller, a member pivotally mounted on the rocker and having first and second pawls projecting therefrom and being disposed on opposed sides of the corresponding first and second ratchet wheels, said improvement comprising a spring loaded member mounted on the dobby head and normally biased to urge said pawls in one direction to thereby urge the first pawl into engagement with the corresponding ratchet wheel for imparting stepby-step movement to the pattern chain with movement of the rocker, a cam rotatably mounted on the dobby head, mechanical connections between said cam and the spring loaded member, means driven by the loom for operating the dobby head and means operatively connected to the last-named means for imparting rotation to said cam in timed relation to operation of the loom, said cam having a high point and a low point thereon, whereby, upon one of the points of said cam moving into engagement with said mechanical connections, the spring loaded member will be moved in a direction opposite to the direction in which it is biased to thus move the second pawl into engagement with the corresponding ratchet wheel for alternately imparting step-bystep movement to the pattern chain in a reverse direction.

9. An improvement in a dobby head for looms having dobby fingers, dobby knives, dobby jacks and a rocker operatively connected to the dobby knives for imparting reciprocatory motion thereto, a roller having a pattern chain mounted thereon, first and second ratchet wheels having oppositely directed teeth thereon and being operatively connected to the roller, a member pivotally mounted on the rocker and having first and second pawls projecting therefrom and being disposed on opposed sides of the corresponding first and second ratchet wheels, said improvement comprising a spring loaded member mounted on the dobby head and normally biased in one direction to cause one of said pawls to transmit stepby-step movement to the pattern chain in one direction with movement of the rocker, a'third ratchet wheel rotatably mounted on the dobby head, a third pawl pivotally mounted on one of the dobby jacks and adapted to oscillate therewith for imparting step-by-step movement to the corresponding third ratchet wheel, a cam member having a high surface and a low surface thereon operatively connected to said third ratchet wheel, an oscillatable arm having one end thereof normally engaging one of the surfaces of said cam, a connection between the free end of said oscillatable arm and the spring loaded member whereby, upon the other surface of said cam engaging the oscillatable arm, the connection between the other end of the oscillatable arm and the spring loaded member will impart movement to the spring loaded member to move the other of the pawls into engagement with the corresponding ratchet wheel for imparting step-bystep movement to the pattern chain in the opposite direction.

I4 10. An improvement in a dobby head for looms having dobby fingers, dobby knives, dobby jacks and a rocker operatively connected to the dobby knives for imparting reciprocatory motion thereto, a roller having a pattern chain provided with pattern links mounted thereon, a first ratchet wheel operatively connected to the roller, a, member pivotally mounted on the rocker and having a first pawl projecting therefrom and having its free end normally resting upon the first ratchet wheel, said improvement comprising a normally upwardly biased spring loaded member disposed above the first ratchet wheel, a connection between the first pawl and the spring loaded member, a pattern controlled special jack carried by the dobby head and adapted to move in opposite directions with each pair of picks woven by the loom, a second pawl carried by the special dobby jack, a second ratchet wheel rotatably mounted on the dobby head and having a cam thereon provided with a high point and a low point, said second pawl normally resting upon said second ratchet wheel, an oscillatable lever oscillatably mounted on the dobby head and having one end thereof normally engagin the low point on said cam, a mechanical connection between said spring loaded member and the special dobby jack, another mechanical connection between the free end of said oscillatable lever arm and the spring loaded member, said connection between the special dobby jack and the spring loaded member normally moving the spring loaded member in a direction opposite from the direction in which it is biased to normally permit the first pawl to impart step-by-step movement to the ratchet wheel and the associated roller upon movement of the rocker whereby, upon said pattern means effecting operation of the special dobby jack, the dobby jack will cause its associated pawl to subsequently impart a step in rotation to the second ratchet wheel and will also permit the spring loaded member to move upwardly to lift the first pawl out of engagement with the first ratchet wheel to thus cause the patterning on a single link of the pattern chain to be effective for operating the jacks other than the special jack for a predetermined number of picks, and whereby, upon the high point of said cam engaging the adjacent end of said oscillatable lever, the mechanical connection between the free end of said lever and the spring loaded member will again cause the spring loaded member to move downwardly to again permit the corresponding first ratchet pawl to impart another step in rotation to the first ratchet wheel and its roller to thus cause the pattern chain to operate in a normal manner until operation of the special jack is again effected by the patterning on said pattern chain.

IVEY C. MORRIS.

REFERENCES CITED Name Date Number Moberg Dec. 13, 1949 

